b08a86171f
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3
123 lines
4.3 KiB
C
123 lines
4.3 KiB
C
/************************************************************
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* sem_destroy.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name Gregory Nutt nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************/
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/************************************************************
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* Included Files
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************************************************************/
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#include <sys/types.h>
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#include <semaphore.h>
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#include "sem_internal.h"
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/************************************************************
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* Compilation Switches
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************************************************************/
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/************************************************************
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* Definitions
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************************************************************/
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/************************************************************
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* Private Type Declarations
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************************************************************/
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/************************************************************
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* Global Variables
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************************************************************/
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/************************************************************
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* Private Variables
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************************************************************/
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/************************************************************
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* Private Functions
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************************************************************/
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/************************************************************
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* Public Functions
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************************************************************/
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/************************************************************
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* Function: sem_destroy
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*
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* Description:
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* This function is used to destroy the un-named semaphore
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* indicated by sem. Only a semaphore that was created
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* using sem_init() may be destroyed using sem_destroy();
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* the effect of calling sem_destroy() with a name semaphore
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* is undefined. The effect of subsequent use of the
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* semaphore sem is undefined until sem is re-initialized
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* by another call to sem_init().
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*
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* The effect of destroying a semaphore upon which other
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* processes are currently blocked is undefined.
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*
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* Parameters:
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* sem - Semaphore to be destroyed.
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*
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* Return Value:
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* 0 (OK), or -1 (ERROR) if unsuccessful.
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*
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* Assumptions:
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*
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************************************************************/
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int sem_destroy (sem_t *sem)
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{
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int ret = ERROR;
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/* Assure a valid semaphore is specified */
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if (sem)
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{
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/* There is really no particular action that we need
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* take to destroy a semaphore. We will just reset
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* the count to some reasonable value (1).
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*
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* Check if other threads are waiting on the semaphore.
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* In this case, the behavior is undefined. We will:
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* leave the count unchanged but still return OK.
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*/
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if (sem->semcount >= 0)
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{
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sem->semcount = 1;
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}
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ret = OK;
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}
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return ret;
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}
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